CN201434918Y

CN201434918Y - Optical fiber grating device

Info

Publication number: CN201434918Y
Application number: CN2009202329677U
Authority: CN
Inventors: 龙品
Original assignee: WUXI OPTICAL CORE TECHNOLOGY Co Ltd
Current assignee: WUXI OPTICAL CORE TECHNOLOGY Co Ltd
Priority date: 2009-07-17
Filing date: 2009-07-17
Publication date: 2010-03-31
Anticipated expiration: 2019-07-17

Abstract

The utility model discloses an optical fiber grating device, which is an optical fiber grating slice with a thickness of less than or equal to 5 millimeters, wherein two end faces of the optical fibergrating slice are ground and polished and can be plated with anti-reflection films. The optical fiber grating slice can be obtained by cutting a multimode optical fiber grating into thin slices or cutting a single-mode optical fiber grating into thin slices. The optical fiber grating slice can be arranged in a glass ferrule slice. As the device is thin, the wave surface of a light beam has no obvious change after the light beam passes through the optical fiber grating slice, namely, light beam properties have no obvious change after converging light, diverging light or parallel light passes through the optical fiber grating slice. When the optical fiber grating slice is used, light beams are not required to be coupled into optical fibers, so the optical fiber grating slice can be used infree space definitely. In case of a small light beam diameter, a single optical fiber grating slice can be used. In case of big light beam diameter, an optical fiber grating slice array formed by arranging a plurality of optical fiber grating slices in two dimensions can be used.

Description

A kind of fiber bragg grating device

Technical field

The utility model relates to a kind of fiber bragg grating device.

Background technology

From 1978, people such as Canadian Hill find phenomenon of photosensitivity and adopt standing wave method to produce in the world that the people such as Melt of first fiber grating and the U.S. in 1989 have realized that the UV laser side of optical fiber Bragg raster (FBG) has write since the technology first in germanium-doped silica fiber, the manufacturing technology of fiber grating is constantly perfect, and people become more extensive to fiber grating in the research aspect light sensing, the optical communication.

Fiber-optic grating sensor have the anti-electromagnetic interference (EMI) of general sensor, highly sensitive, size is little, in light weight, cost is low, outside the advantage that is suitable for using in environment such as high temperature, corrosivity, it is strong and utilize multiplex technique to realize the unique advantage of multipoint multiplexing, the distributed discriminating measurement of many reference amounts on an optical fiber from relevant ability also to have intrinsic.So fiber-optic grating sensor has become the research focus when front sensor.

Fiber grating is a kind of optical fibre device.Fiber grating is the structure (grating) that forms periodic variations in refractive index with the method that two-beam is interfered on the core diameter of optical fiber.Fiber grating is in optical communication, Fibre Optical Sensor, and laser technology, fields such as photoelectron have a wide range of applications.Because fiber grating is a kind of optical fibre device, light must be coupled in the optical fiber could use fiber grating.The length of fiber grating in optical fiber is generally 1 millimeter to 100 millimeters.Also the someone produces the fiber grating greater than 1 meter.The one or both ends of conventional fiber grating all have optical fiber pigtail, if use fiber grating, at first must be coupling light in the optical fiber, the loss of luminous energy is just very big like this, make the use of fiber grating be subjected to some restrictions, as adopting the outer mode selection by short-cavity of fiber grating as semiconductor laser, the light of laser instrument must couple light in the optical fiber earlier.And laser of narrowband is to use rather than use in optical fiber at free space in many cases, also will light be coupled out from optical fiber, causes the luminous energy unnecessary loss.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of novel optical fiber and optical grating device, overcome when existing fiber bragg grating device is used and to couple the beam into the big problem of optical energy loss in the optical fiber, make light beam pass through still in free space, to propagate behind the fiber bragg grating device.

For solving the problems of the technologies described above, a kind of fiber bragg grating device that the utility model provides is that thickness is cut into slices smaller or equal to 5 millimeters fiber gratings.

Two end faces of fiber grating section are the grinding and polishing face, and end face can plate anti-reflection film;

The section of described fiber grating can be adopted multi-mode optica lfiber grating to cut into thin slice and obtain, and also can adopt the single-mode fiber grating to cut into thin slice and obtains;

Described fiber grating section can be arranged in section of glass lock pin or the ceramic insertion core section.

Beneficial effect: the fiber grating section is a kind of novel optical fiber and optical grating device, its thickness generally is no more than 5 millimeters, because device is thin, light beam changes little through fiber grating section back wave front, no matter be converging light, diverging light, or after the section of directional light process fiber grating, the characteristic of light beam does not have very big variation.The section of use fiber grating does not need to couple the beam in the optical fiber, can use in free space fully.If beam diameter is less, can cut into slices with single fiber grating.If beam diameter is bigger, can be with the fiber grating just a plurality of fiber gratings of the array section two-dimensional arrangements of cutting into slices.

The useful area of fiber grating section depends on the type of the optical fiber that fiber grating is used.The used optical fiber of fiber grating is single-mode fiber, and then the useful area of fiber grating section is just smaller.Used optical fiber is multimode optical fiber, and then the useful area of fiber grating section is just bigger.Core diameter as used optical fiber is 50 microns, and the useful area of fiber grating section is exactly 50 microns.The optical fiber that a kind of air cladding layer mould is arranged at present, promptly the covering of optical fiber is an air, then with the useful area of the fiber grating section of the optical fiber fabrication of this air cladding layer and big or small the same (after the removing coat) of optical fiber.

The fiber grating section is owing to having lot of advantages, so its application will be very widely.As optical communication, laser technology, sensing, instrument is measured biotechnology etc.

Description of drawings

Fig. 1 interferes the synoptic diagram that forms fiber grating by two-beam;

Fig. 2 is arranged in the glass lock pin for fiber grating, add between in fiber grating and the glass lock pin fill behind the glue synoptic diagram;

Fig. 3 is arranged in the glass lock pin for fiber grating, and the glass lock pin is cut sheet synoptic diagram;

Fig. 4 has the glass lock pin thin slice two sides grinding and polishing of fiber grating and plates the synoptic diagram that anti-reflection film forms single fiber grating section;

Fig. 5 is the exocoel application structure synoptic diagram of fiber grating section as laser instrument;

Fig. 6 a is the effect structural representation of fiber grating section as a bandreject filtering sheet;

Fig. 6 b is the structural drawing of fiber grating section array 51;

Fig. 7 is the effect structure function figure of fiber grating section as a bandreject filtering sheet;

Fig. 8 is the structural representation of fiber grating section as light radio temperature sensor (non-contact temperature sensor).

Embodiment

Below in conjunction with accompanying drawing particular content of the present utility model is described further.

A kind of fiber bragg grating device is that thickness is smaller or equal to 5 millimeters fiber grating sections 21.

Two end surface grinding polishings of fiber grating section, two end faces of described fiber grating section 21 plate anti-reflection film.

Described fiber grating section 21 is adopted multi-mode optica lfiber grating to cut into thin slice and is obtained; Described fiber grating section 21 also can be adopted the single-mode fiber grating to cut into thin slice and obtain.

Described fiber grating section 21 is arranged in section of glass lock pin or the ceramic insertion core section 29.

Application examples 1: the fiber grating section is used for the effect that the laser instrument exterior resonant cavity reaches laser instrument modeling and stable laser output wavelength.As shown in Figure 6.

Application examples 2: fiber grating section be used for wave filter application.As shown in Figure 7.

Application examples 3: the fiber grating section is used for (wireless) temperature sensor of free space and uses.As shown in Figure 8.

What Fig. 1 presented is that fiber grating 21 is to be formed through interfering by two bundle ultraviolet light beams 43, and optical fiber 20 comprises fibre core 25 and covering 26, and fiber grating writes on the fibre core 25.

What Fig. 2 presented is the inner structure of glass lock pin 29 and fiber grating 21.On fiber grating 21, coat some glue 28, insert the inner chamber of glass lock pin 29 (or ceramic insertion core) then, be placed on the heat curing of carrying out glue in the baking oven then, or carry out the curing of glue with ultraviolet light.So fiber grating 21 and glass lock pin 29 just are solidified togather.

What Fig. 3 presented is will have fiber grating 21 glass lock pins 29 to be cut into a bit of thin slice, and grinding and polishing is carried out on the two sides of a bit of glass lock pin 29 that cuts.Glass lock pin 29 (the having the fiber grating section) two sides that has processed is plated anti-reflection film 42.The section of formation fiber grating.

What Fig. 4 presented is after the glue between glass lock pin 29 and the fiber grating section 21 is removed, only remaining fiber grating section 21, and the two sides is coated with anti-reflection film 42.

What Fig. 5 presented is that fiber grating section 21 (not with the glass lock pins) directly are fixed on the front end face 12 near semiconductor laser body 10 plating anti-reflection films.The plating high-reflecting film rear end face 11 of laser bodies 10 and fiber grating section 21 form a laser external cavity, launch the laser of single wavelength.

What Fig. 6 a presented is the application of fiber grating section array 51 as the rejection filter of a free space, incident is a wideband light source 52, wideband light source light beam 52 is cut into slices by fiber grating behind the array 51, the light beam 53 of a bandwidth is reflected, and remaining light 54 sees through fiber grating section array 51.Fig. 6 b has shown the structural drawing of fiber grating section array 51, and fiber grating section array 51 is not to be made of many fiber grating sections 21.

What Fig. 7 presented is the function of example application Fig. 6.Incident be a wideband light source, reflection be in the middle of a band.Transmission be remaining spectrum.

What Fig. 8 presented is the fiber grating section 21 light radio temperature sensors as a free space.A branch of light sends from collimated light source 63, through behind the half-reflecting half mirror 62, arrives on the temperature sensor 66 that is made of the fiber grating section through convergent lens 65 again.The temperature sensor 66 that the fiber grating section constitutes is installed on the object 67. when the temperature of object 67 changes, the fiber grating section cycle in the temperature sensor 66 that the fiber grating section constitutes changes, the light wavelength that reflects back is changed. survey catoptrical wavelength variations by photo-detector 64, temperature that can Measuring Object.

Claims

1, a kind of fiber bragg grating device is characterized in that: be that thickness is the fiber grating section (21) smaller or equal to 5 millimeters.

2, fiber bragg grating device according to claim 1 is characterized in that: two end faces of described fiber grating section (21) are the grinding and polishing face, are provided with anti-reflection film.

3, fiber bragg grating device according to claim 1 is characterized in that: described fiber grating section (21) is the multi-mode optica lfiber grating thin slice.

4, fiber bragg grating device according to claim 1 is characterized in that: described fiber grating section (21) is a single-mode fiber grating thin slice.

5, fiber bragg grating device according to claim 1 is characterized in that: described fiber grating section (21) is arranged in section of glass lock pin or the ceramic insertion core section (29).